Generally speaking, dengue (acute infectious disease, visible redness of the skin like paint) external boric acid needs about 10~14 days, but different patients have different conditions and need different treatment time. Dengue is an acute non-purulent inflammation, often involving the skin lymphatic network, mostly due to type B hemolytic streptococcal infection, common in the face and lower limbs. Its onset is rapid, beginning with chills, fever and other systemic symptoms, and in severe cases will cause systemic sepsis, the main local manifestations of the skin rash, and the surrounding tissues are clearly demarcated. The general course of treatment is 10 to 14 days, but for patients with more serious conditions, the time will be relatively longer. Patients suffering from salpingitis should pay attention to rest and regular wet compresses. In severe cases, systemic application of antibiotics, such as intravenous penicillin. Patients with salpingitis should follow the doctor’s instructions to apply boric acid wet compresses, the specific time by the regular doctor informed.